Molding machine



- mmm? 2 h t h t 2 sie, 1920 E. LAYMAN MOLDING ,MACHINE F11 d En Patented Feb. 6, i923.

stares sereni FRANK E. LAYMAN, OF MILWAUKEE, WISCONSIN, ASSIGNOR T0 THE CUTLER- HAMMER MFG. CO., OF MELVAUKEE, WISCONSIN, A CORPORATION OF WIS- CONSIN. f

MOLDNG MACHINE.

Application filed June 26, 1920.

To all whom t may concern s Be it known that l, FRANK Fi. LAYMAN, a citizen of the United States, residing at iliilwaukee.y in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Molding Machines, of which the following is a full, clear, concise, and exact description. reference being had to the accompanying drawing, forming 'a part of this specification.

This invention relates to molding machines and more particularly to machines for molding articles from plastic material.

My prior Patent 1,150,437, August 17, 1915, discloses a machine for molding an attachment plug insulating part having a screw threaded extremity. This machine includes a pair of lateral forming dies to be projected into the molding space to form screw threads on the extremity of the article during therefrom to permit ejection of the article from the mold. These forming dies are hand operated and the output of the molding machine is therefore largely dependent upon the dexterity of the operator in manipulating said die parts without delaying successive operations of the press.

This invention has among its object-s to provide an improved molding' machine wherein the lateral forming dies are automatically projected into the molding space during forming of the article and retracted therefrom for ejection of the article.

Various other objects and advantages will hereinafter appear.

The accompanying drawing illustrates an embodiment of the invention which will now be described, it being understood that the embodiment illustrated is susceptible of various modifications, without departing from the scope of the appended claims.

In the drawing,

Fig. 1 is` a vertical sectional view ot a molding machine embodying the invention;

Fig. 2 is a horizontal sectional view taken substantially on line 2-2 of Fig. l;

Fig. 3 is a vertical sectional view taken at substantially right angles to the view shown in Fig. 1;

Fig. 4 is a side elevational view of certain of the parts shown in Figs.` 1 and 2;

Fig. 5 is a perspective view ot one of the lateral forming dies; and,

molding thereoi:l and retractable Serial No. 391,907.

Fig. 6 is a vertical sectional view of the 55 molded article.

The molding machine illustrated includes a mold 1 to be mounted on the bed of the press and having an opening therein to receive the. material, an upper die 2 movable 50 by the crosshead of the press into said opening to mold the material therein, a lower die 3 movable upwardly by the ejecting mechanism of the press to eject the article from the mold and a pair of lateral forming dies 4 to be projected into said opening during forming of the article and retractable therefrom to permit ejection of the article.

The mold 1 comprises a bed plate 5 70 having a mold box 6 secured thereto by a yoke member 7. The bed plate 5 is arranged for mounting on the bed ot the press in the usual manner and is centrally recessed to receive a circular plate -8 having stop pins. 9 mounted thereon to abut the lower face of mold box 6. Mold `box 6 is cone shaped and fits within a centrally bored portion in yoke member 7 and the latter is secured to bed plate 5 by the 80 bolts 10 to clamp said mold box against stop pins 9. Mold box 6 is centrally bored to provide a molding space of the desired contour and comprises an upper member 6a having a diametrical recess 11 in its 85 lower face to receive dies 4 and a lower member 6b secured to the former by screws 12.

Dies 4 are arranged on opposite sides of the bore in mold box 6 and each is pro- 90 the free end of said pawl to receive a cam member 17. The pawls 14 are normally held in alignment with their respective dies by a spring 18 and are movable downwardly against the action of said spring to a position indicated by dotted lines in Fig. 1. The

`cam members 17 are arranged for mounting on the crosshead of the press and each 1s 'provided with spaced cam projections 19 and Dies 4 extend 95 in its lower position the cam members 17' are then ipvositioned shown in Fig'. l. ln

this position dies 4 are projected into the bore in mold box 6 and are locked .inst outward movement by engagement oi cam projections "lo with inner walls oit openings 16 in said dies. lfrfith dies 4 projected, the inner ends of paws 14 are located in the path ot' cam projections and assuming,` upward movement ot 'the crosshead. cam projections 19 are moved out ot engagement with the walls 16a and immediately *there otter the tapered.. ends ot cam n'ojections Q1 are moved into eng rement with the tree ends oli pawls t move the die members 4 outwardly and retract the same 'trom the bore in mold box t3. vUpon retr 'ion ot dies 4, walls 1.6"" are moved into the path oi cam projections 20 and upon continued up-` ward movement oli' the crosshead., the tapered surface of car-:1 'projections 2O engage the walls 16n to move the dies inwardly to project the same into the bore in mold box 6. During downward movement, ot the crosshead. vthe abrupt'.shoulders Qi or can'. projections 2l engage the upper faces ot their' respective pawls 14 and move said pawls downwardlyout of the path of said cam projections. The cam members are therefore inetfective to move the die members 4 outwardly during downward movement ot the crosshead and during final downward movement o' the crosshead cam projections 19 are moved into ei agement with surfaces 16ZL to insure full projection of dies Thus, it is apparent that during' downward movement ot the crosshead. dies 4 will be projected into the molding' space to reduce a `given cross-sectional area oi' the article being 'formed and during return or the' crosshead such die parts are moved outwardly to permit ejection ot the article 'from the mold.

The cam members 1'? are each slidablv Vmounted between inner and outer guide members 24 and 25 secured'to yolre member 7 by a bracket 26. Said guide members are each provided with openings to receive the die member 4 associated with its respective camp member 17 and guide members 25 are each cut away below the pawl members 14 to'` permit downward movement ot the latter. The brackets 26 have theirunder side recessed las shown 1n Fig'. 4 to receive dies 4 and e'achhas a member 27 secured to the under side thereof by screws 28.' The menibers 9,7 are each provided with a pin 2,9 `to support the spring' 18ct the adjacent pawl and as best shown in ll" Z each ot the springs 18 is coiled about pin 29 on oppo site sides ot its respective pawi and is provided with a ttshaped portion to engage its respective pawl and with extremities to engane the under side ot its respective die l.

The atoredescribed mold is designed lor molding' attachment plug` members such shown in Fig. t3. For this purpose the bore in mold box G is shaped to snit the side walls ot the article shown in this and .is also provided with a projecting-"'VV 3l) in the bore thereof to torni a slot 31 in the molded article. The die faces lb. are corrugated to provide the screw threaded portion on the exterior ot the article and as shown in 2, the die 'tac 1S arecut away to accommodate the projecting rib between the same.

The upper die 2 is arranged 'tor mounting' on the crosshead ot the ypress in the usual manne c and has its lower face shaped to suit the top surface oit the article shown in Fig. 6. r)The same is also provided with a cen-- trally located projecting pin 52 to toria the central passage 38 in said article. rlhe lower die 3 normally rests on the upper 'face of plate 8 and is connected to the ejecting' mechanism ot the press by a plurality of rods 34. its is well understood7 the electing mechanism of the press is adapted to move the die 3 upwardly within the mold durinp` the return stroke ot 'the crosshead and is adapted to return die 8 prior to downward movement ot the crosshead. The lower die 3 has its upper 'tace shaped to suit the under side ot' the molded article shown in Fig. il and the same is longitudinally bored to rev ceive a pin 35 for termino` an opening 36 in said article. Said die is also provided with a centrally located projecting pin 38 said pin servino' to center a threaded bush-v ing; 39 in the article during molding` thereof.

1t is apparent that many changes may be made in the proportions and arrangement of the parts ot the a'foredescribed molding' machine to adapt the same to mold articles ot various sorts without departing 'from the scope ot the appended claims.

l/Vhat 1 claim as new and desire to secure by Letters atent is:

1. 1n a machine for molding articles 'from plastic material. `in combination, a mold having' an' openingr therein to receive the material. a plurality of reciprocatory die parts cooperating therewith, certain of said parts to be projected into andy retracted :irom said opening)I at an angle to the axis thereof and another being movable within said opening' to mold thearticle and out of said opening to permit ejection of the article, and cam operating means for auto'- matically projecting and retracting the former of said die parts in a given time relation with respect to certain movements of the latter.

2. ln a machine for molding articles from plastic material, in combination, a mold having an opening therein to receive the material, a reciprocatorv die movable into said mold to form the article and movable out of the same to permit ejection of the article lateral forming dies to be projected into and retracted from said opening at an angle to the axis thereof and means movable bv said reciproca-tory die for automatically projecting.;` said latter dies into said opening during forming of the articles and for retracting the same therefrom to permit ejection of the article.

In a machine for molding articles from plastic material. in combination, a mold having` an opening therein to receive the material, a plurality of reciprocatorv die parts co-operating therewith certain of said parts to be projected into and retracted from said opening at an angle to the axis thereof, and another of said parts being movable into said opening to mold the article and out of said opening to permit ejection of the article and means including an element movable by the latter of said die parts for projecting and retracting the former of said die parts.

4. In combinationq a hollovv mold having openings through the walls thereof, a reciprocatory plunger movable into and out of said mold, dies adapted to be projected through the openings in said mold and a cam operating member for each of said dies movable bv said plunger through a given range, each of said cam members having cam projections for projecting its respective die part during movement thereof into either extreme position and having another meer? cam surface for retracting its respective die part during movement thereof through an intermediate part of its rangen said latter cam surface being effective only when cam member moves in a given direction.

5. ln combinationT a hollow mold having openings through the Walls thereof, a reciprocatorv plunger movable into and out of said mold` dies adapted to be projected. through the openings in said mold and means associated with sa id plunger for automatically projecting and retra cting said dies upon reciprocation of said plunger.

6. ln combination-r a hollow mold having openings through the Walls thereof@ areciprocatorv plunger movable into and out of said moldq dies adapted to be projected through the openings in said mold9 and means for automatically projecting and retracting said dies upon reciprocation of said plunger, said means including a cam operating member for each of said dies movable with said plunger.

7. In combination1 a hollow mold having openings through the Walls thereof, a reciprooatory plunger movable into and out of said mold, dies adapted to be projected through the openings in said mold, a paivl mounted on each of said dies and a cam member for each of said dies movable by said plungen each of said cam members being adapted during movement of said, plunger out of said mold to lirst engage the pavvl on its respective die to retract the latter and to thereafter engage said dies to project the same said pavvls being movable out of the path of said cam members duiiing movement of said plunger into said mo In Witness whereof, I have hereunto subscribed my name.

' FRANK E. LAYMAN. 

